Question: Can a beaker full of water be placed on a table and steam run through the water in the beaker to boil the water at atmospheric pressure? Answer: The temperature of steam at normal atmospheric pressure is 100°C. If that steam is run in the beaker, the water will be heated by absorbing the […]
Question: 100°C boiling water and 100°C steam: Which will burn your hands more? Answer: If 1 g of steam at 100°C releases 537 calories of heat, 1 g of water at 100°C is formed. So, steam at 100°C contains more heat than boiling water at 100°C. So if you put your hands in the steam,
100°C boiling water and 100°C steam: Which will burn your hands more? Read More »
Question: Why latent heat cannot be measured with a thermometer? Answer: When a substance changes its state, the substance absorbs or gives off some heat which is not expressed externally. That heat does not help increase the temperature of matter but helps change the state of matter. This heat is called latent heat. Since absorption
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The phenomenon of the liquid gradually turning into vapour only from the surface at any temperature is called the evaporation of liquid. Boiling is the rapid evaporation of all parts of a liquid at a given temperature. Differences between Evaporation and Boiling The following are important differences between Evaporation and Boiling: Evaporation Boiling (i) Evaporation can
The phenomenon of the liquid gradually turning into vapour only from the surface at any temperature is called the evaporation of liquid. The following are some important factors affecting the rate of evaporation. Factors Affecting the Rate of Evaporation (i) Surface area of the liquid: The greater the surface area of the liquid, the faster
The conversion of liquid into a vapour state is called the Vaporisation of liquid. The phenomenon of the liquid gradually turning into vapour only from the surface at any temperature is called the evaporation of liquid. Factors Affecting the Rate of Evaporation The rate of evaporation depends on the following factors: (i) Surface area of
The ability to do work is called energy. Most activities in modern life require energy. For comfort and convenience, we consume energy in the form of fossil fuels, electricity, and firewood. What is Energy Crisis? Along with the advancement of civilization, the demand for energy is increasing enormously. Growing population and massive industrialization require a
When the nuclei of heavy elements such as uranium, plutonium etc. are split by neutrons, the new elements formed are less in mass than the previous elements. This reduced mass is converted into energy according to the formula E = mc2. This energy is called nuclear energy. Following are some important Nuclear energy transformation examples.
Various functions are performed with the help of heat. Engines run by turning water into steam with heat. So, heat is a form of energy. Again, the heat generated by the combustion of diesel and petrol is used to run automobiles and aeroplanes. Following are some important Heat energy conversion examples. Heat Energy Conversion Examples
Numerous works are done with the help of electricity. With the help of electricity fans run, lights turn on, and trains run. Electricity is essential energy in factories. So electricity is a kind of energy. Following are some important Electrical energy transformation examples. Electrical Energy Transformation Examples Conversion of electrical energy to other energy: Electrical
